i ran into the same problem. I made a dirty fix by running sudo chmod +x /usr/bin/apt sudo chmod +x /usr/bin/apt-key sudo apt update sudo install powertop Hopefully powertop gets included in the next release
Please be aware this is the RC1 thread, this is NOT required on RC1.
That being said: Powertop has been accepted and will be available on future SCALE releases. It sadly enough got missed for the first release due to an CI fluke.